I have an engine similar to yours (mine has a Magnum 280 cam), and I went with an Edelbrock RPM only because I could not get a polished Air Gap. I toyed with the idea of using a Victor Jr. simply because it would have given me almost 25 hp more on top end, but I would have lost a lot of bottom end torque, and given the fact that most of my driving time was below 3500 rpm , and because I don't drag race the car, I decided the RPM was the most logical choice. I port matched it to the AFR 190 heads, and it made 450 hp and 467 ft lbs of torque on the dyno. No disappointments.